but president obama, the obama campaign, very focused right now on trying to build momentum and excitement ahead of the democratic national convention. they are starting their road to charlotte campaign right here in iowa, and we are told that one of the themes today is going to be to highlight what the obama campaign is calling american heroes, people who have overcome great challenges during this difficult economy, during this difficult time in our nation's history. so we're going to hear from some of them in addition to hearing from the president. as you say, he's going to have a very busy holiday weekend. from here he heads to colorado. 's going to take a little bit of a break from the trail on monday to visit louisiana, to visit with some of the folks who were impacted by isaac. that trip comes on the heels of mitt romney visiting louisiana on friday. by the way, both campaigns saying that there really is no problem with romney having visited the region earlier. the obama campaign pointing to the fact that they really had made their plans prior to knowing about mitt romney's plans. bu